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Problem
With span gas flowing
through the monitor after
approximately one-minute
display reads one (1) to the
far left
When calibrating the CO
monitor you cannot move
display off zero '00' with
zero potentiometer
Display goes below 0 (i.e.
display indicates a –02,
-1, SC)
Monitor display
numbers wander and
alarm periodically
Potential Cause
Span potentiometer may be
turned clockwise all the way
The sensor has lost sensitivity
Monitor may have been
adjusted '00' using the
span potentiometer
Zero misadjust
Sensor has internal failure
Circuit malfunction
Monitor is powered by the
110-120 volt AC adapter and
walkie-talkies are being used
near the monitor
Large voltage spikes are
present in the AC circuit
Ambient temperatures exceed
110º F (43º C)
16
Corrective Action
Adjust the zero potentiometer
counterclockwise to 199 and
then turn down to value of
span gas
Replace the sensor
Turn the span potentiometer
screw several full revolutions
clockwise until the display
reads the value of the span
gas then start the calibration
procedure over again
Recalibrate the monitor
Replace the sensor
Repair is needed
Do not use walkie-talkies
in the area
Isolate by using dedicated line
Decrease ambient temperature